> For the complete documentation index, see [llms.txt](https://pda-assignments.consoleflare.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pda-assignments.consoleflare.com/python-for-data-analytics/1.python/2.python-assignments/string-assignments.md). # String Assignments 1. ***`String is a Collection of __________`***
Solution **Characters**
2\. ***`Strings are enclosed within _________`*** * ***`Single Quotes (' ')`*** * ***`Double Quotes (" ")`*** * ***`Triple Quotes (''' ''' or """ """)`*** * ***`Any of the Above`***
Solution **Any of the above**
*3.* Ask the user to enter their name and display it in reverse order (last name first). Sample Input: Ayush Mishra\ Sample Output: Mishra Ayush
Solution ```python name=input('Enter your name:') name=name.split(' ') rev_name=name[-1] + name[0] print(f'Reversed Name:{rev_name}') ```
4. Take a word as input from the user and print the first and last character.
Solution ```python word=input('Enter a word:') print(f'First character:{word[0]') print(f'Last character:{word[-1]') ```
5. ***`What is the Positive and negative index number of space in Word - David Joseph:`***
Solution **Positve Index number of first letter D starts with 0, hence index number of space will be: 5** **Negative Index number of last letter h is -1, hence index number of space will be: -7** **Code :** **`name = 'David Joseph'`** **`pi = name.find(' ')`** **`print('Positive index : ',pi)`** **`total_char = len(name)`** **`ni = pi - total_char`** **`print('Negative index : ',ni)`**
6. **`How to get the first character in upper case from the name inputted by the User.`** \ **`For example :`** \ **`name : 'david Joseph'`** \ **`Output : D`**
Solution **First thing that we need to do , is to take input from user.** **`name = input('Enter Your Name : ')`** **Now name given by user can be in lower case or in upper case or a mix of it. But we need first character in uppercase, So what method do we use to convert string in Upper case :** [**upper()**](https://training.gitbook.io/python-documents/strings-in-pythn#2.upper-method\\)**.** **`result = name[0]`** **It will give you first character , but we need to be sure that it is in uppercase. So it is better to assign this value in result.** **`result = name[0].upper()`** **`print(f'First Character in String is {result}.')`**
7. **`You work in a company and you are given customers number, But many customers filled wrong data, so you need to check if the number given by customer is right or not.`** **`Phone Number should match following Criteria :`** 1. **`Only numbers , spaces are allowed though (so few customers wrote their number with spaces.)`** 2. **`10 character only.`** For Example {% tabs %} {% tab title="Example 1" %} `input : 976 543 2319` **Output :** `check_number : True` `ten_character : True` {% endtab %} {% tab title="Example 2" %} `input : 976 543 a319` **Output :** `check_number : False` `ten_character : False` {% endtab %} {% endtabs %}
Solution **First thing that we need to do is to take input from User.** **`number = input('Enter Customer Number : ')`** **Now as we know that spaces are allowed, So it is better to replace them with nothing , so that we don't have to worry about them.** **`number = number.replace(' ','')`** **Now we need to check out first criteria and that is to check if it is number.** **`check_number = number.isnumeric()`** **Now we need to check our second criteria and that is to check if there are only 10 digits.** **`ten_character = len(number)==10`** **Voila !!!** **`print(f'Check Number : {check_number}')`** **`print(f'Ten character : {ten_character}')`**
8. **`Find the second maximum digit from a number`.**
Solution **First thing that we need to do is to take input from User.** **`number = input('Enter the number : ')`** **Now what we need to do is to find the maximum number.** **`first_max = max(number)`** **Remove this maximum number from the number, so that our second maximum number** **`number = number.replace(first_max,'')`** **Now that the maximum number is removed from the string, We can find our second maximum number** **`second_max = max(number)`** **`print(second_max)`**
9. **`You work in a bank, You are tasked to create a pin with the help of their customer name and birthyear .`** {% tabs %} {% tab title="Example" %} **`Input Customer Name : david josh`** **`Input Date Of Birth : 09-12-1997`** **`Output:`** **`pin : David1997`** {% endtab %} {% endtabs %}
Solution **First we will take inputs from user.** **`name = input('Enter Customer Name : ')`** **`dob = input('Enter date of birth : ')`** **Now we need to split first name from the user `name` and convert it into title.** **`firstname = name.split(' ')[0].title()`** **Now we need to get year from User Date of Birth , we can achieve it by splitting last four digits.** **`year = dob[-4:]`** **Let's concatenate both to get Customer's pin number.** **`pin = firstname + year`** **`print(pin)`**
10. **`You are tasked to swap first and last characters of a string.`** `For Example:` {% tabs %} {% tab title="Example" %} **`Input string : 'python'`** **`Output :`** **`'nythop'`** {% endtab %} {% endtabs %}
Solution **First we will take input From user.** **`name = input('Enter the string : ')`** **We will get First and last character with the help of indexing.** **`f = name[0]`** **`l = name[-1]`** **Now we need to slice middle string, It means from second character to second last character.** **`mid_str = name[1:-1]`** **Now you can concatenate in desired order.** **`print(l+mid_str+f)`**
11. **`Take a String from user consisting only alphabets and spaces, and count How many Consonants and Vowels are in the string.`** {% tabs %} {% tab title="Example" %} **`input string : 'This is example'`** **`Output :`** **`Total Alphabets : 13`** **`Total Vowels : 5`** **`Total Consonants : 8`** {% endtab %} {% endtabs %}
Solution ```python #Take a string input from user. st = input('Enter the string : ').lower() #Now that we do not need spaces , let's remove them for good, by replacing them with empty string. st = st.replace(' ','') #Now only alphabets are in the string , so let us calculate number of alphabets by using len() function. total_alpha = len(st) #Now to count all vowels , we will use count method. total_vowel = st.count('a')+st.count('e')+st.count('i')+st.count('o')+st.count('u') #To count Consonants, all we need to do is to subtract total vowel from total alphabets. total_cons = total_alpha-total_vowel #Voilla !!! print(total_alpha) print(total_vowel) print(total_cons) ```
12. **`Check if a string is palindrome or not. Palindrome is a string that does not change even if you reverse it.`** For example: {% tabs %} {% tab title="Example" %} **`input string : 'rotator'`** **`Output:`** **`Palindrome : True`** **`input string : 'python'`** **`Output:`** **`Palindrome : False`** {% endtab %} {% endtabs %}
Solution **Let us take an input from user.** **`st = input('Enter the string : ')`** **Let us reverse the string.** **`new_st = st[::-1]`** **Now let's compare both strings.** **`print(st==new_st)`**
13. **`Imagine You run an Institute where all your students are stored in a variable something like this :`** **`students = 'david mark bill sam'`** **`You have a few tasks to do like :`** * [x] **Add a student given by user** * [x] **Delete a student given by user** * [x] **Check if a student given by user is present or not** * [x] **Replace a Student given by user** {% tabs %} {% tab title="Add a student" %} **`students = 'david mark bill sam'`** **input :** **`Enter the name of the student : jeff`** **`david mark bill sam jeff`** {% endtab %} {% tab title="Delete a student" %} **`students = 'david mark bill sam'`** **input :** **`Enter the name of the student : sam`** **`david mark bill`** {% endtab %} {% tab title="Find a student" %} **`students = 'david mark bill sam'`** **input :** **`Enter the name of the student to find : sam`** **`True`** {% endtab %} {% tab title="Replace a student" %} **`students = 'david mark bill sam'`** **input :** **`Enter the name of the old student to replace : sam`** **`Enter the name of the new student : karen`** **`david mark bill karen`** {% endtab %} {% endtabs %}
Solution **So we are given a string for reference; let us use this reference of students to perform such operations.** **`students = 'david mark bill sam'`** * [x] **Add a student given by user** **`student = input('Enter the name of the student : ')`** **`students = students + student`** * [x] **Delete a student given by user** **`student = input('Enter the name of the student : ')`** **`students = students.replace(student,'')`** * [x] **Check if a student given by user is present or not** **`student = input('Enter the name of the student : ')`** **`check = student in students`** **`print(check)`** * [x] **Replace a Student** **`old_student = input('Enter the name of the student to replace : ')`** **`new_student = input('Enter the name of the new student: ')`** **`students = students.replace(old_student,new_student)`** **`print(students)`**
14. Find out the name of the company from a URL inputted by the user.\ Example:\ url= [www.facebook.com\\](http://www.facebook.com\\) Output: facebook
Solution ```python url=input('Enter a url') url=url.split('.') company_name=url[1] print(f'The name of the company is:{company}' ```
15. Input an email address and extract the username part (before the @).
Solution ```python email=input('Enter Email ID:') username= email[0:email.find('@')] print(f'Your Username:{username}') ```
16. Take a string input, count the number of vowels and then remove all the vowels.
Solution ```python str1=input('Enter a string:').lower() total_vowels= str1.count('a') + str1.count('e') + str1.count('i') + str1.count('o') + str1.count('u') str1=str1.replace('a','').replace('e','').replace('i','').replace('o','').replace('u','') ```
17. Ask the user for two strings and check if the second string is a substring of the first.
Solution ```python str1=input('Enter a sting:') substr=input('Enter a substring:') result= substr in str1 print(f'Substring:{result}') ```
**Which of the following is not a valid string method in Python?** a) upper()\ b) lower()\ c) title()\ d) subtract()
Solution Answer: d) subtract()
**Which of the following code snippets will concatenate two strings in Python?** a) string1.append(string2)\ b) string1.join(string2)\ c) string1 + string2\ d) string1.concat(string2)
Solution Answer: c) string1 + string2
**Which of the following is the correct way to access the first character of a string in Python?** a) string\[1]\ b) string\[0]\ c) string\[2]\ d) string\[-1]
Solution Answer: b) string\[0]
**Which of the following code snippets will reverse a string in Python?** a) string.reverse()\ b) reversed(string)\ c) string\[::-1]\ d) string.reverse\_string()
Solution Answer: c) string\[::-1]
**Which of the following code snippets will return the length of a string in Python?** a) len(string)\ b) string.length()\ c) string.len()\ d) length(string)
Solution Answer: a) len(string)
**Which of the following code snippets will replace all occurrences of a substring in a string in Python?** a) string.replace(old, new)\ b) string.sub(old, new)\ c) string.replace\_substring(old, new)\ d) string.substitute(old, new)
Solution Answer: a) string.replace(old, new)
**Which of the following code snippets will split a string into a list of substrings based on a delimiter in Python?** a) string.split(delimiter)\ b) string.divide(delimiter)\ c) string.cut(delimiter)\ d) string.separate(delimiter)
Solution Answer: a) string.split(delimiter)
**Which of the following code snippets will convert a string to all lowercase letters in Python?** a) string.lowercase()\ b) string.to\_lower()\ c) string.lower()\ d) string.convert\_to\_lower()
Solution Answer: c) string.lower()
**Which of the following code snippets will remove leading and trailing whitespace from a string in Python?** a) string.strip()\ b) string.trim()\ c) string.remove\_whitespace()\ d) string.trim\_whitespace()
Solution Answer: a) string.strip()
**Which of the following code snippets will check if a string starts with a specific substring in Python?** a) string.check\_start(substring)\ b) string.begins\_with(substring)\ c) string.startswith(substring)\ d) string.starts(substring)
Solution Answer: c) string.startswith(substring)
**Which of the following code snippets will split a string into a list of characters in Python?** a) string.split()\ b) string.chars()\ c) list(string)\ d) string.list()
Solution Answer: c) list(string)
**Which of the following code snippets will check if a substring exists in a string in Python?** a) string.exists(substring)\ b) string.contains(substring)\ c) substring in string\ d) string.sub(substring)
Solution Answer: c) substring in string
**Which of the following code snippets will count the number of occurrences of a substring in a string in Python?** a) string.count(substring)\ b) string.occurrences(substring)\ c) string.find(substring)\ d) string.index(substring)
Solution Answer: a) string.count(substring)
**Which of the following code snippets will check if all characters in a string are alphanumeric in Python?** a) string.is\_alpha\_num()\ b) string.is\_alphanumeric()\ c) string.isalpha() and string.isdigit()\ d) string.isalnum()
Solution Answer: d) string.isalnum()
**Which of the following code snippets will convert a string to a list of words in Python?** a) string.split()\ b) string.words()\ c) list(string)\ d) string.list\_words()
Solution Answer: a) string.split()
**Which of the following code snippets will check if a string ends with a specific substring in Python?**
a) string.end(substring)\ b) string.check\_end(substring)\ c) string.endswith(substring)\ d) string.ends(substring)
Solution Answer: c) string.endswith(substring)
**Which of the following code snippets will return the index of the first occurrence of a substring in a string in Python?** a) string.find(substring)\ b) string.index(substring)\ c) string.first(substring)\ d) string.search(substring)\ e) Both **a** and **b**
Solution Answer: option **e**
**Which of the following code snippets will check if all characters in a string are in lowercase in Python?** a) string.islower()\ b) string.is\_lowercase()\ c) string.islowercase()\ d) string.is\_lower\_case()
Solution Answer: a) string.islower()
**Which of the following code snippets will remove all occurrences of a character in a string in Python?** a) string.remove(char)\ b) string.delete(char)\ c) string.replace(char, '')\ d) string.sub(char, '')
Solution Answer: c) string.replace(char, '')
**Which of the following code snippets will check if all characters in a string are in uppercase in Python?** a) string.is\_uppercase()\ b) string.isupper()\ c) string.is\_upper()\ d) string.is\_upper\_case()
Solution Answer: b) string.isupper()